Paul Anka has returned to Poland to play a show he cancelled 48 years ago when U.S. President John F. Kennedy was assassinated.The crooner was just 22 when he called off a concert in Warsaw's Sala Kongresow venue at the last minute after learning Kennedy had been shot dead in Texas in 1963. Anka, now 77, arrived in the city on Tuesday (15Nov11) for a belated gig in the same concert hall where he was originally due to perform. The veteran singer refused take part in any interviews to ensure his voice was on form for the Wednesday (16Nov11) show. Anka's assistant Julie Zhu explains, "We just arrived in Warsaw and Mr. Anka needs to rest his voice and is not doing any interviews. The tour is going very well."